CHOCOLATE SANDWICH COOKIES

Steps:

• 1. Cream together butter, sugar, egg and vanilla until light and fluffy.
• 2. Add flour, cocoa, baking soda and salt all at once. Mix until just well combined.
• 3. Divide dough in half. Shape each half into a 1 inch diameter roll and wrap in plastic wrap or waxed paper. You may need to refrigerate it a while to make it easier to shape.
• 4. Refrigerate 4 hours or overnight until it's firm enough to slice. Heat oven to 375.
• 5. Slice rolls 1/8 inch thick and place slices about 2 inches apart on an ungreased cookie sheet. They'll spread a little more than you may expect - don't place them too close together.
• 6. Bake 8-10 minutes at 375. Remove cookies from pan and cool completely on a wire rack.
• 7. For filling, beat together all ingredients until uniform.
• 8. Make sandwiches of the cookies, either by spreading a bit of filling on the bottom of one cookie then sticking it to the bottom of another or by squishing a small marble size ball of filling between the two.
• 9. Store the cookies covered in the fridge, since the creamy filling contains butter and is perishable.